With a lot of tools and weapons left, the entrance to the underworld was sealed off again.

There is a problem that everyone has ignored before, the problem of the resistance of the underground Han people to this apocalyptic virus.

After several sustained resistances, the human race once again successfully defended the territory in the small cave world, and while everyone was celebrating the tidal night with the fewest casualties in history, a Han man in the crowd suddenly fell to the ground and convulsed, and then his eyes were red, and his mouth made a sound of "He, He", and he rushed to his relatives around him like crazy and began to bite......

After burning more than a dozen human corpses that had turned into zombies, everyone said goodbye to the elders and others, they didn't know if they had extraterrestrial viruses in their bodies or blood, and if an accident led to the destruction of the underground world, the loss to humanity and this world would be irreversible.

After hundreds of millions of years of closed environment, the creatures here have formed a unique ecological chain, if humans spread the extraterrestrial virus here, no one knows what will happen, the best choice is for the surface humans to withdraw, so that this small cave world can be restored to its original state. Until one day human beings can fully grasp the transmission route of the virus and make an effective vaccine, then we will consider whether to reopen the entrance to this channel.

At the end of the 15th century, when Europeans set foot on the American continent, there were between 20 million and 30 million indigenous people, and for the next 100 years, the population of the Americas was reduced to less than one million due to the smallpox virus. The fatality rate of the smallpox virus in Europe is only 10%, while in the Americas it is more than 90%, which is due to the difference in human genetic resistance to the virus.

After the end of the world, the human genes that survived on the surface of the earth all have a certain immunity to extraterrestrial viruses, and these underground Han people may have easily undergone corpse transformation just because of contact with the air or other ways, which shows that the underground humans have no resistance to the virus at all.

The smallpox virus had ravaged the earth for thousands of years, killing hundreds of millions of people, and the World Health Organization finally declared smallpox successful in May 1980. I believe that it will not be long before humanity will one day eliminate this zombie virus, and that is when the entrance to this passage will be reopened.

When everyone returned to the ground, everyone could feel the happiness that came from standing in the sun and breathing freely. The colorful world, the lush vegetation, the blue sky, the white clouds, everything is indescribably comfortable.

During the time that Zhao Xinghua and others were underground, the situation in the urban area of Tanzhou also underwent tremendous changes.

Commander Huang did not imprison Wang Cripple again, but coerced this corpse man to cooperate with humans to clean up the zombies, opened up the most important urban arterial road in Tanzhou from east to west, "Wuyi Avenue", and re-established contact with the Orange Island base located on Jiangxin Island in Xiangjiang, and the two sides jointly sent troops to recover some areas of Tianxin District, Furong District, and Kaifu District, and the southeast of the main urban area of Tanzhou basically returned to the control of human beings.

Especially in Furong District and Tianxin District, there are many large-scale wholesale markets before the end of the day, and there is also a logistics and warehousing center of Tanzhou Railway Station, a national first-class station. The centralized storage of materials in these places greatly alleviated the shortage of resources in the two bases, and also rekindled the light of hope for the post-apocalyptic human survivors.

Liang Hanba, who did not go underground with Zhao Xinghua, led the evolutionary team to join the city cleanup work, and when recovering the Tanzhou Gymnasium on Furong Middle Road, he unexpectedly encountered two oolong foals and his big black cat who were separated from them. These three animals took this open-air venue of more than 18,000 square meters as their own, and the nearby zombies had already been cleared by them. The lawn laid in those arenas has grown wildly into grass more than one person high, and it is estimated that it is precisely because of this that the two high-level evolutionary beasts regard this place as a forbidden place and become a place for them to settle temporarily.

In this clean-up operation, Wang Cripple made a great contribution, and those sonic zombies in the city are the best weapons of large-scale destruction. Infrasound waves are not easy to attenuate, because the wavelength is long, and it can bypass some large obstacles for diffraction, there are almost no dead ends for the work of cleaning up zombies, and zombies hiding in dark corners and buildings are often killed by inexplicable headshots without defense, and the human team can just follow behind most of the time.

The sonic zombies that used to be like conjuring ghosts in the eyes of humans have now become important helpers, and they used to be avoided but now they feel that the number of these things is too small. Each of them can only vocalize once or twice at most, and occasionally three shouting zombies are summoned by the corpses, which are reserved for use as the main force of the ace in capturing large venues.

The survivors of the Orange Island base on Jiangxin Island are also eager to get out of there. When I first arrived on the island, because it was surrounded by water, the bridge was guarded by the military like an iron bucket, isolating all the possibility of zombies appearing. Unfortunately, the good times did not last long, and I don't know when the fishing boats that were fishing in the river to supplement food disappeared and sank one after another, and then the entire team patrolling the river at night disappeared, which made the people of the island panic for a while.

Finally, someone discovered the cause of the incident, some of the big fish in the river have grown to a length of more than 10 meters, it is they who have knocked over the fishing boat, and they have a tendency to go ashore. The island's inhabitants have now seen more than once large fish weighing several tons rushing to shore and swallowing some of the humans fishing or resting, and these large fish are getting deeper and deeper into the island. At present, no one dares to walk 30 meters away from the riverbank, and even in broad daylight, those big fish may suddenly leap out of the water, their teeth as sharp and sharp as chainsaws, and they are lucky to be swallowed in one bite. Two fighters had already been bitten off by them, and when their comrades arrived, only the lower half of their bodies could be seen on the ground.

When Zhao Xinghua and Liang Hanba told Captain Huang that they were leaving, the latter was very surprised, especially Xie Yunhao. But at the insistence of the two, the top person in charge of the Tanzhou Survivor Guardian Center expressed his deep gratitude and gave them two reagents placed in wooden boxes.

It was made from the blood of a prehistoric horseshoe crab brought back from the ground by those scholars.

Not only are the blood of prehistoric horseshoe crabs blue, but the blood of horseshoe crabs that live in the ocean is also light blue, because they have a very high copper content in their blood and clotted when they encounter bacteria. Before the end of the world, scientists used the quality of horseshoe crab blood to make a special test reagent - "horseshoe crab reagent". The main component of the reagent is the hemolysate of horseshoe crab blood cells, which is treated with chloroform to remove the anti-lipopolysaccharide factor, and the LAL reagent can accurately and quickly detect whether the internal tissues of the human body are infected with bacteria or viruses; That is to say, there is no need to wait for the 6-hour incubation period of the zombie virus, and you can immediately determine whether the injured person is infected by the zombie, which is very effective in the battle or transfer with the zombies, and there is no need to be suspicious of each other or wait for several hours.

……

When the sun was about to set, two tall war horses appeared on the G107 national highway not far from Yuezhou.